Thanks for the ground breaking insight, genius. FYI, my players are (on the way to becoming) mutants so I know what I'm talking about. This guy had generic players. My team was not only 11 % stronger in overall quality, but vastly better trained than his. So the actual quality differential was actually way higher than 11 %. Like way way higher. When I said 11 % it was an understatement. That was what the official values showed. My team has an average of 116 %, but in reality, counting by white skills, the average is probably closer to 150 %. My AML/AMR/ST are closer to average 170 % white skills.
Here's an example of his AML vs. my DR. His AML got a 8,2 rating and my DR a 6,0. His only midfielder got a 9,5 rating and MoM award and he was whack attribute wise.